Were the three of them in a situation in which they were shipwrecked or otherwise stranded and starving? And A and B agreed to let X, the only doctor in the group, amputate one arm from each of them to be eaten by the three in order to survive? And A and B extracted a promise from X that if they were ever rescued, he would have his own arm amputated as well?
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Yes! The three men (in the version I read) were in a plane crash, and eventually became desperate enough to resort to cannibalism. Being a man of his word, X had his arm amputated by another doctor, and sent it to A as proof that he held up his end of their pact. Nicely done. :thumbs:
If that's not it, were these guys related to the blind guy on the train?
